It would cause a political earthquake arguably equal to or greater than Roe, in part because the reaction against the decision would be joined by constituencies who aren’t typically skeptical of the judiciary. Just one example: African Americans, who are overwhelmingly against gay marriage. So this would not be just a traditional conservative v. liberal political fight.
I think this will be bigger than Roe because adults do not want their children endangered by homosexuals.
The key to this debate is to get people to question the news media, or more correctly realise the news media IS THE ENEMY.